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Unformatted text preview: The normally distributed AAA battery life is stated to be 350 days when used in a clock radio. The Big Charge Battery Company has recently modified the AAA batteries so as to extent their life. The owner of the company wanted to know if the improved batteries really did last significantly longer. A sample of 100 of the improved batteries was tested. It was discovered that the mean life was 362 days and the sample standard deviation was 10 days. The research department decided to conduct the test at the 0.05 level of significance whether the modification actually increased the life of the AAA battery. What was their decision rule? A. Do not reject the null hypothesis if the z test statistics is 1 B. Reject the null hypothesis if computed z is less th C. Do not reject the null hypothesis if computed z is 1.65 D. Reject the null hypothesis if computed z is 1.96 o 2) The area of rejection, on a bell shaped curve, defines the location of all those values that are 3) A hypothesis test that involves a small sample requires that we make the following assumption that 4) Doi Winery has two wine shops in the neighboring towns of Seamen and Batavia. The favorite wine, as advertised, is Raspberry wine. A survey of 300 customers at the Seamen store revealed that 225 individuals preferred the Raspberry wine while 290 out of 400 in Batavia preferred the same flavor. To test the hypothesis that there was no difference in preferences in the two towns, what is the alternate hypothesis? towns, what is the alternate hypothesis?...
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- Winter '11
- Null hypothesis, Statistical hypothesis testing, Battery Company